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https://issues.apache.org/jira/browse/HIVE-13178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15196415#comment-15196415
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Prasanth Jayachandran edited comment on HIVE-13178 at 3/15/16 10:51 PM:
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I haven't gone through the core changes yet. Left some initial comments. Main
concerns is we are bringing in ObjectInspector back into tree readers which
will make it difficult to separate ORC out of hive. If this feature is targeted
to be supported inside of orc then these object inspectors should be replaced
by TypeDescriptors. Also it will good to subclass TreeReaderFactory to handle
type conversions.
was (Author: prasanth_j):
I haven't gone through core changes. Left some initial comments. Main concerns
is we are bringing in ObjectInspector back into tree readers which will make it
difficult to separate ORC out of hive. If this feature is targeted to be
supported inside of orc then these object inspectors should be replaced by
TypeDescriptors. Also it will good to subclass TreeReaderFactory to handle type
conversions.
> Enhance ORC Schema Evolution to handle more standard data type conversions
> --------------------------------------------------------------------------
>
> Key: HIVE-13178
> URL: https://issues.apache.org/jira/browse/HIVE-13178
> Project: Hive
> Issue Type: Bug
> Components: Hive, ORC
> Reporter: Matt McCline
> Assignee: Matt McCline
> Priority: Critical
> Attachments: HIVE-13178.01.patch, HIVE-13178.02.patch,
> HIVE-13178.03.patch
>
>
> Currently, SHORT -> INT -> BIGINT is supported.
> Handle ORC data type conversions permitted by Implicit conversion allowed by
> TypeIntoUtils.implicitConvertible method.
> * STRING_GROUP -> DOUBLE
> * STRING_GROUP -> DECIMAL
> * DATE_GROUP -> STRING
> * NUMERIC_GROUP -> STRING
> * STRING_GROUP -> STRING_GROUP
> *
> * // Upward from "lower" type to "higher" numeric type:
> * BYTE -> SHORT -> INT -> BIGINT -> FLOAT -> DOUBLE -> DECIMAL
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